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268 lines
5.3 KiB
268 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Atheros Communication Bluetooth HCIATH3K UART protocol |
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* |
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* HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's |
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* power management protocol extension to H4 to support AR300x Bluetooth Chip. |
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* |
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* Copyright (c) 2009-2010 Atheros Communications Inc. |
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* |
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* Acknowledgements: |
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* This file is based on hci_h4.c, which was written |
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* by Maxim Krasnyansky and Marcel Holtmann. |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/tty.h> |
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#include <linux/errno.h> |
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#include <linux/ioctl.h> |
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#include <linux/skbuff.h> |
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#include <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#include "hci_uart.h" |
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struct ath_struct { |
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struct hci_uart *hu; |
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unsigned int cur_sleep; |
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struct sk_buff *rx_skb; |
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struct sk_buff_head txq; |
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struct work_struct ctxtsw; |
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}; |
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#define OP_WRITE_TAG 0x01 |
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#define INDEX_BDADDR 0x01 |
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struct ath_vendor_cmd { |
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__u8 opcode; |
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__le16 index; |
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__u8 len; |
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__u8 data[251]; |
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} __packed; |
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static int ath_wakeup_ar3k(struct tty_struct *tty) |
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{ |
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int status = tty->driver->ops->tiocmget(tty); |
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if (status & TIOCM_CTS) |
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return status; |
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/* Clear RTS first */ |
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tty->driver->ops->tiocmget(tty); |
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tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); |
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msleep(20); |
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/* Set RTS, wake up board */ |
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tty->driver->ops->tiocmget(tty); |
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tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); |
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msleep(20); |
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status = tty->driver->ops->tiocmget(tty); |
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return status; |
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} |
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static void ath_hci_uart_work(struct work_struct *work) |
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{ |
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int status; |
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struct ath_struct *ath; |
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struct hci_uart *hu; |
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struct tty_struct *tty; |
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ath = container_of(work, struct ath_struct, ctxtsw); |
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hu = ath->hu; |
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tty = hu->tty; |
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/* verify and wake up controller */ |
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if (ath->cur_sleep) { |
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status = ath_wakeup_ar3k(tty); |
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if (!(status & TIOCM_CTS)) |
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return; |
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} |
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/* Ready to send Data */ |
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clear_bit(HCI_UART_SENDING, &hu->tx_state); |
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hci_uart_tx_wakeup(hu); |
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} |
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static int ath_open(struct hci_uart *hu) |
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{ |
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struct ath_struct *ath; |
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BT_DBG("hu %p", hu); |
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if (!hci_uart_has_flow_control(hu)) |
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return -EOPNOTSUPP; |
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ath = kzalloc(sizeof(*ath), GFP_KERNEL); |
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if (!ath) |
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return -ENOMEM; |
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skb_queue_head_init(&ath->txq); |
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hu->priv = ath; |
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ath->hu = hu; |
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INIT_WORK(&ath->ctxtsw, ath_hci_uart_work); |
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return 0; |
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} |
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static int ath_close(struct hci_uart *hu) |
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{ |
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struct ath_struct *ath = hu->priv; |
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BT_DBG("hu %p", hu); |
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skb_queue_purge(&ath->txq); |
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kfree_skb(ath->rx_skb); |
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cancel_work_sync(&ath->ctxtsw); |
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hu->priv = NULL; |
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kfree(ath); |
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return 0; |
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} |
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static int ath_flush(struct hci_uart *hu) |
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{ |
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struct ath_struct *ath = hu->priv; |
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BT_DBG("hu %p", hu); |
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skb_queue_purge(&ath->txq); |
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return 0; |
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} |
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static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index, |
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const void *data, size_t dlen) |
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{ |
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struct sk_buff *skb; |
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struct ath_vendor_cmd cmd; |
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if (dlen > sizeof(cmd.data)) |
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return -EINVAL; |
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cmd.opcode = opcode; |
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cmd.index = cpu_to_le16(index); |
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cmd.len = dlen; |
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memcpy(cmd.data, data, dlen); |
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skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT); |
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if (IS_ERR(skb)) |
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return PTR_ERR(skb); |
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kfree_skb(skb); |
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return 0; |
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} |
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static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) |
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{ |
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return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr, |
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sizeof(*bdaddr)); |
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} |
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static int ath_setup(struct hci_uart *hu) |
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{ |
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BT_DBG("hu %p", hu); |
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hu->hdev->set_bdaddr = ath_set_bdaddr; |
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return 0; |
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} |
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static const struct h4_recv_pkt ath_recv_pkts[] = { |
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{ H4_RECV_ACL, .recv = hci_recv_frame }, |
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{ H4_RECV_SCO, .recv = hci_recv_frame }, |
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{ H4_RECV_EVENT, .recv = hci_recv_frame }, |
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}; |
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static int ath_recv(struct hci_uart *hu, const void *data, int count) |
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{ |
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struct ath_struct *ath = hu->priv; |
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ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count, |
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ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts)); |
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if (IS_ERR(ath->rx_skb)) { |
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int err = PTR_ERR(ath->rx_skb); |
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bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); |
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ath->rx_skb = NULL; |
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return err; |
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} |
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return count; |
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} |
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#define HCI_OP_ATH_SLEEP 0xFC04 |
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static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
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{ |
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struct ath_struct *ath = hu->priv; |
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if (hci_skb_pkt_type(skb) == HCI_SCODATA_PKT) { |
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kfree_skb(skb); |
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return 0; |
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} |
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/* Update power management enable flag with parameters of |
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* HCI sleep enable vendor specific HCI command. |
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*/ |
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if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) { |
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struct hci_command_hdr *hdr = (void *)skb->data; |
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if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) |
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ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; |
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} |
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BT_DBG("hu %p skb %p", hu, skb); |
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/* Prepend skb with frame type */ |
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memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
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skb_queue_tail(&ath->txq, skb); |
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set_bit(HCI_UART_SENDING, &hu->tx_state); |
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schedule_work(&ath->ctxtsw); |
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return 0; |
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} |
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static struct sk_buff *ath_dequeue(struct hci_uart *hu) |
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{ |
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struct ath_struct *ath = hu->priv; |
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return skb_dequeue(&ath->txq); |
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} |
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static const struct hci_uart_proto athp = { |
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.id = HCI_UART_ATH3K, |
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.name = "ATH3K", |
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.manufacturer = 69, |
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.open = ath_open, |
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.close = ath_close, |
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.flush = ath_flush, |
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.setup = ath_setup, |
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.recv = ath_recv, |
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.enqueue = ath_enqueue, |
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.dequeue = ath_dequeue, |
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}; |
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int __init ath_init(void) |
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{ |
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return hci_uart_register_proto(&athp); |
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} |
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int __exit ath_deinit(void) |
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{ |
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return hci_uart_unregister_proto(&athp); |
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}
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